i just recently changed the motor in my car... car sounds and rides a lot better but the only thing is that the check engine light keeps coming and my boyfriend and i cant figure out why it keeps coming on and somtimes staying on.. any advice to maybe why this keeps going on?

 

What year is your car/engine? If it is 96 or newer you can take it to Auto-Zone or Advance Auto Parts and they will check it for free. It dosen't matter if the light is on when they check it either. It will store the codes until it is reset.
If it is 95 or older the light will have to be on for them to check it.
The new engine may have just had a bad sensor on it when you got it.

 

my car an engine ae both a 96

 

Take your car to Auto-Zone or Advance Auto Parts, they will check it for free. If it is not on when you get there so long as the battery hasen't been disconnected it will still show the trouble code.